CN101272735A - Optical probe for optical imaging system - Google Patents
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- CN101272735A CN101272735A CNA200680033121XA CN200680033121A CN101272735A CN 101272735 A CN101272735 A CN 101272735A CN A200680033121X A CNA200680033121X A CN A200680033121XA CN 200680033121 A CN200680033121 A CN 200680033121A CN 101272735 A CN101272735 A CN 101272735A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 title claims description 44
- 230000003287 optical effect Effects 0.000 title claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 25
- 239000001301 oxygen Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000036541 health Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract 1
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- INGWEZCOABYORO-UHFFFAOYSA-N 2-(furan-2-yl)-7-methyl-1h-1,8-naphthyridin-4-one Chemical compound N=1C2=NC(C)=CC=C2C(O)=CC=1C1=CC=CO1 INGWEZCOABYORO-UHFFFAOYSA-N 0.000 description 5
- 108010002255 deoxyhemoglobin Proteins 0.000 description 5
- 108010054147 Hemoglobins Proteins 0.000 description 4
- 102000001554 Hemoglobins Human genes 0.000 description 4
- 239000008280 blood Substances 0.000 description 4
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- 238000002329 infrared spectrum Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
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- 238000009792 diffusion process Methods 0.000 description 3
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
- A61B5/14552—Details of sensors specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
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Abstract
Methods and apparatus for monitoring oxygen saturation levels in tissue are disclosed. According to one aspect of the present invention, a sensor arrangement for use in an optical imaging system includes a first source structure, a second source structure, and a detector arrangement. The first source structure provides a first beam of light and the second source structure provides a second beam of light. The detector arrangement includes detector structures that have centerpoints, and receives the first and secon d beams of light after the first and second beams of light are reflected off o f an external surface.; The detector arrangement is arranged to define a first axis that passes through the centerpoint of each detector structure, and a distance from a centerpoint of the first source structure to the first axis is not equal to a distance from a centerpoint of the second source structure to the first axis.
Description
Technical field
The present invention relates generally to monitor the optical imaging system of the oxygen level in the tissue.More specifically, the present invention relates to comprise light source and detector on the sensor head that is arranged in optical probe asymmetricly.
Background technology
Near infrared spectrum has been used for the various physiological attributes of animal and human's object are carried out non-intrusion measurement.The ultimate principle of near infrared spectrum is the lower absorption of various chromophories physiological tissue comprises high scattering and to(for) the near-infrared ripple.Many materials in the medium can interact with the near-infrared light waves that propagation is passed through or interfere.For example, that human tissue comprises is white such as the Oxygenated blood red eggs, many chromophories of deoxyhemoglobin, water, lipid and cytochrome, and wherein hemoglobin is main chromophore in about 900nm spectral region extremely at about 700nm.Thereby, use near infrared spectrum and measured oxygen level in the physiological tissue, as organized hemoglobin oxygen saturation and total hemoglobin concentration.
Researched and developed various technology near infrared spectrum, for example, time resolved spectroscopy (TRS), phase modulation spectrometry (PMS) and continuous wave spectrographic method (CWS).In homogenizing and semi-infinite model, TRS and PMS have been used for obtaining the spectrum of the scattering coefficient that has absorptance and reduced of Physiological Medium by finding the solution the photon diffusion equation, and it is saturated to calculate the concentration and the tissue oxygen that contain oxygen and deoxyhemoglobin.CWS is usually designed to and finds the solution Beer-Lambert equation of having revised and the variation of measuring the concentration that contains oxygen and deoxyhemoglobin.
Although the hemoglobin concentration of providing and oxygen-saturated ability are provided, the major defect of TRS and PMS is that this equipment volume is big, and expensive.CWS can be with the low cost manufacturing, but its purposes is restricted, because it can not be white from the Oxygenated blood red eggs and the change calculations oxygen saturation of the concentration of deoxyhemoglobin.
Optics diffusion imaging and spectroscopy (ODIS) allow based on the measurement of photon scattering and absorption tissue to be carried out characterization.In tissue such as human tissue, the greatly scattering of near infrared light quilt, and absorbed minimumly.Realize the optics diffusion imaging by the corresponding diffuse reflectance or the transmission coefficient that optical signalling are sent to tissue and measure on tissue surface.
Scattering is caused by the heterogeneous structure of tissue, thereby is the index of the nuclear size of the density of cell and cell.Cause absorption by interacting with chromophore.ODIS emission light enters tissue by pick off.Launch the light source of this light and the position of the detector that detects this light and allow definite degree of depth of measuring.Oxygenated blood red eggs ratio white and deoxyhemoglobin can be used for permission and roughly measure oxygen (for example, oxygen saturation level) in real time.
In the ODIS system, the pick off that contacts with tissue surface generally has with symmetric layout placement optical fiber thereon roughly.That is, be coupled to the optical fiber of light source to arrange with respect to the roughly symmetric orientation of the optical fiber that is coupled to fluorescence detector.Although symmetric orientation allows to measure oxygen saturation level effectively, the measurement of this pick off is often relatively more difficult, because the accurate layout of pick off inner fiber is crucial.In addition, when the anatomical structure of tissue or basic (underlying) structure are not roughly during symmetry, use pick off to make and be difficult for accurately measuring with symmetric orientation.
Thereby, need a kind of ratio to be easier to the pick off of making and being arranged to use at the tissue that may not have symmetrical anatomical structure.That is, expect a kind of pick off of layout that has the optical fiber that is used for light source and be used for the optical fiber of detector, this layout is convenient to be used to have the almost tissue of any anatomical structure.
Summary of the invention
The present invention relates to have the probe of pick off, described sensor support luminous source optical fiber and detector optic fibers make luminous source optical fiber have with respect to the roughly asymmetric layout of detector optic fibers.According to an aspect of the present invention, sensor device is applicable in the optical imaging system, and is arranged to contact the health such as tissue, and this sensor device comprises first light-source structure, secondary light source structure and detector means.First light-source structure provides the first bundle light, and the secondary light source structure provides the second bundle light.Detector means comprises the detector arrangement that respectively has central point, and receives the first bundle light and second after leaving health at the first bundle light and the second bundle luminous reflectance and restraint light.Detector means is arranged to define the first axle through the central point of each detector arrangement, and the distance from the central point of first light-source structure to first axle is not equal to the distance of secondary light source structure to first axle.
In one embodiment, the distance from the central point of first light-source structure to first axle and be at least about 0.03 millimeter to the difference the distance of first axle from the central point of secondary light source structure.In this embodiment, the distance from the central point of first light-source structure to first axle can be about 0.020 millimeter, and the distance from the central point of secondary light source structure to first axle can be about 0.24 millimeter.
Probe (wherein, pick off or sensor head have the light-source structure with respect to the asymmetric orientation of detector arrangement) with pick off or sensor head makes it possible to utilize sensor head to monitor and has the tissue of basic anatomical structure (it is roughly asymmetric).Lack the manufacturing tolerance that symmetry has been loosened effectively and this pick off of manufacturing is associated.Any decay that is associated with the offset orientation of the optical fiber that is coupled to light source is usually by using the software code devices of carrying out at optical imaging system to compensate.Thereby, can change the compensation dosage that is applied with comparalive ease as required, to adapt to the position error of optical fiber with respect to pick off.
According to a further aspect in the invention, be applicable to that the sensor device in the optical imaging system comprises the secondary light source structure that is arranged to provide first light-source structure of the first bundle light and is arranged to provide the second bundle light.Sensor device also comprises detector means, and detector means comprises first detector arrangement with first nodal point and second detector arrangement with second central point.Detector means is arranged to receive the first bundle light and second after leaving health at the first bundle light and the second bundle luminous reflectance and restraints light.First light-source structure is with respect to asymmetric between the orientation of detector means and the orientation of secondary light source structure with respect to detector means.
According to a further aspect in the invention, a kind ofly be used to use optical system that tissue is carried out the method that oxygen saturation is measured, this optical system utilization has the probe of sensor head, in sensor head, first light-source structure and secondary light source structure depart from respect to the detector arrangement of sensor head, described method comprises sensor head is positioned to contact with organizing, and light is entered tissue by first light-source structure and the transmission of secondary light source structure.Described method also is included in the reflected light that the detector arrangement place receives self-organizing, reflected light comprises attenuation characteristic, and use a plurality of photoelectric detectors to handle reflected light, wherein, use a plurality of photoelectric detectors to handle reflected light and comprise use attenuation equalizer compensate for attenuation characteristic.
According to a further aspect in the invention, probe is arranged to the part as optical system, and optical system is arranged to monitor the oxygen level in the tissue, and described probe comprises coupling interface, and coupling interface is arranged to allow probe to be coupled to a plurality of light sources and a plurality of detector.The sensor head of probe is arranged to contact described tissue, and supports first light-source structure, secondary light source structure and detector means.First light-source structure and secondary light source structure are arranged to be coupled to a plurality of light sources via coupling interface, and detector means is arranged to be coupled to a plurality of detectors, first light-source structure with respect to asymmetric between the orientation of detector means and the orientation of secondary light source structure with respect to described detector means by coupling interface.
In one embodiment, detector means comprises the detector arrangement that respectively has central point.In this embodiment, leave the tissue detector means reception afterwards first bundle light and the second bundle light at the first bundle light and the second bundle luminous reflectance.Detector means defines first axle, described first axle is through the central point of each detector arrangement of a plurality of detector arrangement, makes distance from the central point of first light-source structure to first axle be not equal to the distance from the central point of secondary light source structure to first axle.
When reading following detailed description and studying various accompanying drawing, these and other advantage of the present invention will become obvious.
Description of drawings
Come in conjunction with the drawings can understand the present invention best with reference to following description, in the accompanying drawing:
Figure 1A is a block diagram of representing to have according to the embodiment of the invention optical imaging system of sensor head, and wherein sensor head comprises the light source with respect to the detector offset arrangement.
Figure 1B is expression, and (that is) block diagram, the optical imaging system of Figure 1A, wherein sensor head comprises the light source with respect to the detector offset arrangement according to the optical imaging system with sensor head of the embodiment of the invention.
Fig. 2 A is the schematically illustrating of sensor head that has a pair of light source according to the embodiment of the invention, and wherein, a pair of light source is with respect to the pair of detectors offset arrangement.
Fig. 2 B is the schematically illustrating of sensor head that has a pair of light source according to first embodiment of the invention, and wherein, a pair of light source is with respect to one group of four detector offset arrangement.
Fig. 2 C is the schematically illustrating of sensor head that has a pair of light source according to second embodiment of the invention, and wherein, a pair of light source is with respect to one group of four detector offset arrangement.
Fig. 3 is that expression is according to the light source that is associated with sensor head of the embodiment of the invention and the block diagram of detector.
Fig. 4 be diagram utilization has a kind of process chart of method of the sensor head of light source according to the embodiment of the invention, wherein light source is with respect to the detector offset arrangement.
Fig. 5 comprises schematically illustrating of control station and optical imaging system that can uncoupled probe according to the embodiment of the invention, wherein, can comprise the sensor head with light source by uncoupled probe, and described light source is with respect to the detector offset arrangement.
The specific embodiment
Sensor head makes optical fiber be coupled on the light source, and is arranged in the orientation that departs from respect to the optical fiber that is coupled to detector, to allow utilizing sensor head organizing in the roughly not symmetric zone of being monitored.Usually compensate any decay that is associated with the offset orientation of the optical fiber that is coupled to light source by software.Such sensor head ratio is easier to make, because be coupled to the layout rigidity lower (that is, can proofread and correct any slight variations of fiber arrangement by the software of using compensation decay) of the optical fiber of light source.In addition, using software to compensate the decay that is associated with fiber arrangement on the sensor head can make sensor head be used for symmetry or asymmetric tissue anatomical structure basically.
It should be appreciated by those skilled in the art that the roughly just following tissue volume of sensor head can be homogenizing or heterogeneous body, this depends on the actual anatomical structures that comprises in this volume.For example, when sensor head is positioned on the skin on the thick zone of fatty tissue, comprises the red proteic seal of Oxygenated blood and guard against (signet) cell and distribution capillaceous roughly relatively evenly (that is, symmetry and homogenizing).Yet sensor head can be positioned on such tissue volume, and the basic structure in the described tissue volume comprises tremulous pulse, vein, bone, tendon, cartilage, fascia, muscle or mottle.This tissue can have asymmetric anatomical structure, makes light be reflected asymmetricly or absorb by for example reflexive or absorbefacient zone.The software of compensate for attenuation can be eliminated with reflecting and leave the reading that the light such as the structure of bone is associated.The optical fiber that is coupled to light source and is positioned in the sensor head with the orientation that departs from respect to the optical fiber that is coupled to detector can promote transmission and read the light of avoiding such as the structure of bone.Thereby the use in offset source optical orientation is convenient to form specialized sensor head, and this specialized sensor head can be used for measuring the oxygen saturation of many different parts of health.
Figure 1A is the block diagram of expression according to the optical imaging system with sensor head of the embodiment of the invention, and it comprises the light supply apparatus of arranging with the orientation that departs from respect to detector means.Optical imaging system 100 comprises via connecting interface 112 coupled unit 104 and probes 108.Connecting interface 112 generally is the close property of the light interconnection device that has the laser safety interlock, and the laser safety interlock is arranged to roughly prevent that the light of laser instrument when probe 108 is not coupled to unit 104 from sending by connecting interface 112.Connecting interface 112 generally includes the panel adapter (not shown) that is connected to unit 104 and is connected to the cable connector (not shown) of probe 108.
The light that sends by first light source 116 and be provided to bundling device 124 via the optical fiber (not shown) by the light that secondary light source 120 sends.Each laser diode that is associated with first light source 116 and each laser diode that is associated with secondary light source 120 are arranged on the independent optical fiber (not shown).Bundling device 124 merges the light and the light that merges from each laser diode of secondary light source 120 from each laser diode of first light source 116 effectively.The light that merges is provided to connecting interface 112 via the output optical fibre (not shown) then.Output optical fibre is arranged to allow that light that merge or combination is homogenized roughly is evenly distributed on the output optical fibre when light enters 112 time of connecting interface guaranteeing.
By connecting interface 112, light is provided to the sensor head 128 of probe 108.In sensor head 128, merging light that the optical fiber (not shown) will be associated with first light source 116 and the merging light that is associated with secondary light source 120 are provided to the surface that is arranged to contact tissue 132 of sensor head 128.The optical fiber (not shown) is positioned to them and has the orientation that departs from respect to the optical fiber (not shown) that is associated with photoelectric detector 136 in the unit 104.The orientation of luminous source optical fiber and detector optic fibers will be described with reference to Fig. 2 A-2C following.
When sensor head 128 made the light transmission enter tissue 132, reflected light was collected with photoelectric detector 136 coupled fluorescence detector optical fiber (not shown).Generally, at least two photoelectric detectors 136 are included in the unit 104, and are configured to the light sensitivity by first light source 116 and secondary light source 120 transmissions.Attenuation equalizers 140 in the unit 104 roughly are arranged to compensate the catoptrical any decay that causes with respect to the orientation that departs from of detector optic fibers (not shown) owing to the luminous source optical fiber (not shown).In one embodiment, attenuation equalizer 140 uses mathematical algorithm to afford redress effectively, this algorithm component ratio, and attenuation quotient can appear in molecule and the denominator in this ratio, thereby can be cancelled.Such ratio can use by photoelectric detector 136 detected light intensities the less mode of influence of the optical properties of the tissue 132 below the estimated sensor head 128 with decay factor.Should be understood that attenuation equalizer 140 generally can roughly be attached in the software or hardware of carrying out the algorithm of determining oxygen saturation level.
Figure 1B is the block diagram of expression according to the optical imaging system 100 of Figure 1A of the embodiment of the invention, and it shows the path of the light that light source (that is, first light source 116 and the secondary light source 120 of Figure 1A) sends.When the light time that first light source 116 sends two wavelength, the light of the light of the first wavelength 152a and the second wavelength 152b is provided to bundling device 124, and bundling device 124 is merged into light beam 152c with this light effectively, and it is provided to sensor head 128 by for example luminous source optical fiber.Similarly, when the light time that secondary light source 120 sends two wavelength, the light of the light of the first wavelength 156a and the second wavelength 156b is merged into light beam 156c by bundling device 124, and it is provided to sensor head 128. Light beam 152c, 156c transmission enter tissue 132, and tissue 132 is left in reflection, arrive photoelectric detector 136 by sensor head 128 then.
As described above, luminous source optical fiber is arranged such that and is being arranged to and is organizing the sensor head surface that contacts that luminous source optical fiber has the orientation that departs from respect to fluorescence detector optical fiber.With reference to Fig. 2 A, will the orientation of luminous source optical fiber with respect to detector optic fibers be described according to the embodiment of the invention.Sensor head 200 can roughly have Any shape or size, and is the part of probe, and probe is a part of measuring the whole system of the oxygen saturation level in the tissue.Sensor head 200 is arranged to hold light supply apparatus 240a, 240b and detector means 208a, 208b.In order to be easy to discuss, although light supply apparatus 204a, 204b generally is optical cable or the optical fiber that is coupled to light source, detector means 208a, 208b generally is optical cable or the optical fiber that is coupled to photoelectric detector, but here with light supply apparatus 204a, 204b is called light source, detector means 208a, 208b is called detector.
Different with distance y 2 between centrage 214 and the centrage 218 between centrage 214 and the centrage 216 along the distance y 1 of y axis 212b.Although distance y 2 is depicted as greater than distance y 1, should be understood that distance y 1 also can be greater than distance y 2.Be not both light source 204a between distance y 2 and the distance y 1,204b is with respect to detector 208a, 208b arranged offset, the perhaps roughly uneven general characteristic of arranging.In other words, make light source 204a effectively, the layout of 204b lacks symmetry.
Generally, can be used in combination plural detector with pair of detectors and monitor oxygen saturation in the tissue.For example, three or four detectors can be used for detecting by a pair of light source provides and reflects the light that leaves tissue surface.Should be understood that some light can reflect from tissue at the various degree of depth place under tissue surface.That is, light can reflect the tissue that leaves tissue surface and leave lower face.Under the surface and the tissue that allows light to be reflected can reach about next centimetre of tissue surface deeply.Fig. 2 B is the schematically illustrating of sensor head that is arranged to comprise a pair of light source (a pair of light supply apparatus or rather) and four detectors (four detector means or rather) according to the embodiment of the invention.Sensor head 220 comprises four detector 228a-d, and they are arranged to make the central point of detector 228a-d roughly to align along the centrage 234 that is roughly parallel to x axis 232a.Sensor head 220 also comprises light source 224a, 224b, and they respectively comprise central point.The centrage 236 that is parallel to x axis 232a passes the central point of light source 224a, and the centrage 238 that is parallel to x axis 232a passes the central point of light source 224b.
In described embodiment, be not equal between centrage 234 and the centrage 238 distance y 2 along the distance y 1 of y axis 232b between centrage 234 and the centrage 236 along y axis 232b.Distance y 1 can be about 0.2 millimeter (mm), for example be about 0.197mm, and distance y 2 can be roughly 0.24mm, for example 0.236mm.Should be understood that distance y 1 and distance y 2 can depend on any amount of factor and change significantly.These factors include but not limited to light source 224a, the application that the overall dimensions of 224b and detector 228a-d, the overall dimensions of sensor head 220 and sensor head 220 are planned.Although distance y 2 is depicted as greater than distance y 1, distance y 1 also can be greater than distance y 2.Generally, the difference between distance y 2 and the distance y 1 is at least about 0.3mm.For example, the difference of distance y 2 and distance y 1 can be about 1.0mm.
Although it is unequal with respect to the y axis pick off to be lacked the distance that symmetry is described as between pick off and the detector with respect to the position of detector, lacks symmetry and also can replace or additionally have lacking symmetry with respect to the x axis.Then with reference to Fig. 2 C, description is comprised the sensor head of a pair of light source, described a pair of light source is arranged along the x axis runout with respect to one group of four detector.Sensor head 240 comprises four detector 248a-d, but the quantity of detector 248a-d can change.Detector 248a-d is arranged to make centrage 254 to be roughly parallel to x axis 252a, and passes the central point of each detector 248a-d.The first detector 248a and last detector 248d (promptly with respect to x axis 252a separately farthest detector) are used for limiting the center of detector 248a-d to separated time 262.The center is parallel to y axis 252b to separated time 262, and be arranged such that central point from detector 248a to the center to separated time 262 apart from x3 be substantially equal to central point from detector 248d to the center to separated time 262 apart from x4.That is, the center is arranged through the mid point between the central point of the central point of detector 248a and detector 248d to separated time 262, and the center that makes is approximately perpendicular to centrage 254 to separated time 262.
As shown, the central point of the central point of the first light source 244a and the first detector 248a is along centrage 257 alignment that are roughly parallel to y axis 252b.Similarly, the central point of the central point of secondary light source 244b and last detector 248d is along centrage 259 alignment that are roughly parallel to y axis 252b.But, should be understood that centrage 257 can pass the central point of the first detector 248a, centrage 259 can pass the central point of last detector 248d.That is, centrage 257 is actually the line that is roughly parallel to y axis 252b and passes the first light source 244a, and centrage 259 is actually the line that is roughly parallel to y axis 252b and passes secondary light source 244b.
Centrage 257 and center between the separated time 262 apart from x1 be not equal to centrage 259 and center between the separated time 262 apart from x2, in other words, the first light source 244a and secondary light source 244b distance center are unequal to the distance of separated time 262.Thereby light source 244a, 244b are positioned at respect to x axis runout or unbalanced orientation.
Light source is arranged to send the light of specific wavelength usually.As mentioned above, the light of the low wavelength that is sent by light source can have the wavelength of about 690nm, and the light of the upper wavelength that light source sends can have the wavelength of about 830nm.Fig. 3 is the light source that is associated with sensor head according to the embodiment of the invention of expression and the block diagram of detector.First light source can comprise produce wavelength be about 690nm light laser diode 302a and produce the laser diode 302b that wavelength is about the light of 830nm.Similarly, secondary light source can comprise that the generation wavelength is about the laser diode 306a of the light of 690nm, and produces the laser diode that wavelength is about the light of 830nm.
With reference to Fig. 4, will the oxygen-saturated method of using in the oximeter supervision tissue with sensor head be described according to embodiments of the invention, oximeter has sensor head, and light source is in the orientation that departs from respect to detector in this sensor head.The processing 400 of using oximeter wherein applies probe against tissue in step 404 beginning, promptly comprises the probe of sensor head, and light source is positioned at the orientation that departs from respect to detector in this sensor head.In step 408, in case sensor head is positioned to contact with organizing, the first light source S1 related with probe will send than the light pulse of low wavelength and enter in the tissue.The first light source S1 can comprise and produces the laser diode that wavelength is about the visible red of 690nm as mentioned above, but the low wavelength of the light that the first light source S1 produces can change.Generally, the first light source S1 is the light supply apparatus that produces the light of two wavelength.Thereby the first light source S1 can comprise that two laser diodes that roughly separate produce the light of two wavelength.
At step S412, the detector means that is associated with probe detects the light of about 690nm.As mentioned above, when the light transmission of about 690nm enters when organizing, the luminous reflectance of about 690nm enters detector means, makes the detector (for example, photoelectric detector) that comprises in the detector means collect reflected light.In step 416, the first light source S2 sends the light pulse (being the light pulse of about 690nm in description embodiment) of low wavelength then.In step 420, detector means detects and collects the reflected light of about 690nm.
In step 424, in case the first light source S1 and secondary light source S2 have launched the light of low wavelength, then the first light source S1 enters tissue with the light pulse transmission of upper wavelength.The light pulse of upper wavelength can be the about 830nm near infrared light that is produced by the included laser diode of the first light source S1.The light pulse transmission of about 830nm enter organize reflection then after, handling process proceeds to step 428, wherein detector means detection of reflected light.
In step 432, secondary light source S2 sends the light pulse (for example, wavelength is about the light of 830nm) of upper wavelength, reflects then to leave tissue and reflect in step 436 to enter detector means.In step 440, in case detector means has all received the reflected light of low wavelength and upper wavelength from two pick offs, the information that is associated with the reflected light that receives of the data acquisition arrangement process of oximeter then.Processing receives reflected light can comprise that the software of the decay that execution is associated with reflected light with the compensation of account form or alternate manner or hardware are to determine and to organize the oxygen level that is associated.In case data acquisition arrangement process this information, monitor the finishing dealing with of oxygen saturation level of tissue.However, it is to be understood that the step of Fig. 4 can repeat roughly to monitor oxygen saturation level continuously.
Utilize the oximeter with probe of sensor head of the present invention can comprise the portable control console unit that probe can be coupled to.As shown in Figure 5, control station 500 can comprise screen 504, and this screen is arranged to show the oxygen saturation level of the tissue that just is being monitored.Screen 504 can be a touch screen, can also be arranged to represent when probe 520 uses, and will represent that the alarm when the oxygen saturation level that monitors has problem offers user.
Although only described some embodiments of the present invention, should be understood that the present invention can implement with many other concrete forms under the situation that does not break away from spirit of the present invention or scope.For example, the wavelength that sends of light source has been described as about 690nm and about 830nm.Yet, can send any wavelength by light source basically.
The probe that sensor head is installed to can have various structure.For example, probe can comprise the handpiece of being convenient to tissue is carried out point measurement.In addition, the structure of sensor head can also depend on the used application-specific of sensor head and change.
For example the probe of optical fiber probe (sensor installation head on it) uses optical cable with optical signalling transportation turnover tissue.Optical cable can have any length, and can comprise a double-wavelength light source optical fiber at each light source, comprises a detector at each detector.In one embodiment, optical cable can be about three meters long, and luminous source optical fiber and detector optic fibers can respectively have the diameter of about 1mm.
The central point of luminous source optical fiber and the central point of detector optic fibers have been described as the central point that the orientation is roughly circular optical fiber substantially.Should be understood that in some cases, when the orientation of optical fiber was not roughly circular, central point can be the approximate centerpoint of optical fiber.
The step that is associated with the whole bag of tricks of the present invention can change widely.Under the situation that does not break away from spirit of the present invention or scope, can add, change, remove and resequence step.Thereby this example will be understood that it is illustrative rather than restrictive, and the present invention is not limited to the details that provides herein, but can revise within the scope of the claims.
Claims (21)
1. sensor device, described sensor device is applicable in the optical imaging system that described sensor device arrangement becomes body contact, described sensor device comprises:
First light-source structure, described first light-source structure are arranged to provide the first bundle light;
Secondary light source structure, described secondary light source structural configuration become to provide the second bundle light; And
Detector means, described detector means comprises a plurality of detector arrangement, described detector arrangement respectively has central point, described detector means is arranged to be reflected at the described first bundle light and the described second bundle light and receives the described first bundle light and described second after leaving described at least health and restraint light, wherein, described detector means is arranged to define first axle, described first axle is through the central point of each detector arrangement of described a plurality of detector arrangement, and wherein, the distance from the central point of described first light-source structure to described first axle is not equal to the distance from the central point of described secondary light source structure to described first axle.
2. sensor device according to claim 1, wherein, described first light-source structure is first optical cable that is coupled to first light source, described first light-source structure is second optical cable that is coupled to secondary light source.
3. sensor device according to claim 1, wherein, described a plurality of detector arrangement are a plurality of fluorescence detector optical cables that are coupled to a plurality of photoelectric detectors.
4. sensor device according to claim 1, wherein, described sensor device is the part of probe, and wherein, described optical imaging system is an oximeter.
5. sensor device according to claim 1, wherein, the distance from the described central point of described first light-source structure to described first axle and be at least about 0.03 millimeter to the difference the distance of described first axle from the described central point of described secondary light source structure.
6. sensor device according to claim 5, wherein, described first light-source structure has about 1 millimeter diameter, and described secondary light source structure has about 1 millimeter diameter, and each detector arrangement of described a plurality of detector arrangement has about 1 millimeter diameter.
7. sensor device according to claim 6, wherein, distance from the described central point of described first light-source structure to described first axle is about 0.020 millimeter, and the distance from the described central point of described secondary light source structure to described first axle is about 0.24 millimeter.
8. sensor device according to claim 1, wherein, described a plurality of detector arrangement comprise at least two detector arrangement.
9. sensor device, described sensor device is applicable in the optical imaging system that described sensor device is arranged to body contact, described sensor device comprises:
First light-source structure, described first light-source structure are arranged to provide the first bundle light;
Secondary light source structure, described secondary light source structural configuration become to provide the second bundle light; And
Detector means, described detector means comprises first detector arrangement with first nodal point and second detector arrangement with second central point, described detector means is arranged to be reflected at the described first bundle light and described second bundle and receives the described first bundle light and described second after leaving described health and restraint light, wherein, described first light-source structure is with respect to asymmetric between the orientation of described detector means and the orientation of described secondary light source structure with respect to described detector means.
10. sensor device according to claim 9, wherein, described detector means is arranged to define the first axle through described first nodal point and described second central point, described detector means also is arranged to define second axis, described second axis normal is mid point between described first line and described first nodal point of process and described second central point, wherein, the distance of putting described second axis from first light source center of described first light-source structure is not equal to the distance from the secondary light source central point of described secondary light source structure to described first axle.
11. sensor device according to claim 9, wherein, described first light-source structure is first optical cable that is coupled to first light source, and described secondary light source structure is second optical cable that is coupled to secondary light source.
12. sensor device according to claim 9, wherein, described first detector arrangement and described second detector arrangement are the fluorescence detector cables that is coupled to a plurality of photoelectric detectors.
13. sensor device according to claim 9, wherein, described sensor device is the part of probe, and wherein, described optical imaging system is an oximeter.
14. sensor device according to claim 9, wherein, described first light-source structure has about 1 millimeter diameter, described secondary light source structure has about 1 millimeter diameter, described first detector arrangement has about 1 millimeter diameter, and described second detector arrangement has about 1 millimeter diameter.
15. one kind is used to use optical system that tissue is carried out the method that oxygen saturation is measured, described optical system comprises the probe with sensor head, wherein, first light-source structure of described sensor head and secondary light source structure depart from respect to the detector arrangement of described sensor head, and described method comprises:
Described sensor head is positioned to contact with described tissue;
Light is entered described tissue by described first light-source structure and the transmission of described secondary light source structure;
At the reflected light of described detector arrangement place reception from described tissue, described reflected light comprises attenuation characteristic; And
Use a plurality of photoelectric detectors to handle described reflected light, wherein, use described a plurality of photoelectric detector to handle described reflected light and comprise that the use attenuation equalizer compensates described attenuation characteristic.
16. method according to claim 15, wherein, described attenuation characteristic is to be caused with respect to departing from of described detector arrangement by described first light-source structure of described sensor head and described secondary light source structure, and wherein, described detector arrangement is arranged to define first axle, described first axle is through the central point of each detector arrangement, and the distance from the central point of described first light-source structure to described first axle is not equal to the distance from the central point of described secondary light source structure to described first axle.
17. a probe, described probe are arranged to the part as optical system, described optical system is arranged to monitor the oxygen level in the tissue, and described probe comprises:
Coupling interface, described coupling interface are arranged to allow described probe to be coupled to a plurality of light sources and a plurality of detector; And
Sensor head, it is arranged to contact described tissue, described sensor head is arranged to support first light-source structure, secondary light source structure and detector means, described first light-source structure and described secondary light source structure are arranged to be coupled to described a plurality of light source via described coupling interface, described detector means is arranged to be coupled to described a plurality of detector by described coupling interface, wherein, described first light-source structure is with respect to asymmetric between the orientation of described detector means and the orientation of described secondary light source structure with respect to described detector means.
18. probe according to claim 17, wherein, described first light-source structure and described secondary light source structure are arranged to the light from described a plurality of light sources is provided to described tissue, and the light that described a plurality of detector is arranged to reflection is left described tissue is provided to described a plurality of detector.
19. probe according to claim 17, wherein, described detector means comprises a plurality of detector arrangement, described a plurality of detector arrangement respectively has central point, described detector means is arranged to receive the described first bundle light and described second after leaving described tissue at the described first bundle light and the described second bundle luminous reflectance and restraints light, described detector means is arranged to define first axle, described first axle is through the central point of each detector arrangement of described a plurality of detector arrangement, wherein, the distance from the central point of described first light-source structure to described first axle is not equal to the distance from the central point of described secondary light source structure to described first axle.
20. probe according to claim 19, wherein, the distance from the central point of described first light-source structure to described first axle and be at least about 0.03 millimeter to the difference the distance of described first axle from the central point of described secondary light source structure.
21. probe according to claim 17, wherein, described detector means comprises first detector with first nodal point and second detector with second central point, described detector means is arranged to define the first axle through described first nodal point and described second central point, described detector means also is arranged to define second axis, described second axis normal is in described first line and through the mid point between described first nodal point and described second central point, wherein, the distance of putting described second axis from first light source center of described first light-source structure is not equal to the distance from the secondary light source central point of described secondary light source structure to described first axle.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104411241A (en) * | 2012-05-03 | 2015-03-11 | 维奥普蒂克斯公司 | Tissue oximetry probe geometry for robust calibration and self-correction |
| CN104411241B (en) * | 2012-05-03 | 2017-09-08 | 维奥普蒂克斯公司 | The probe geometry based on the tissue oxygenation of robust calibration and self-correcting |
| CN107108272A (en) * | 2014-11-21 | 2017-08-29 | 木质部知识产权管理有限责任公司 | UV sensors |
| CN107108272B (en) * | 2014-11-21 | 2021-01-12 | 木质部知识产权管理有限责任公司 | UV sensor |
| WO2017054715A1 (en) * | 2015-09-30 | 2017-04-06 | 齐心 | Apparatus and method for measuring vital signs |
Also Published As
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| US7355688B2 (en) | 2008-04-08 |
| EP2389862A1 (en) | 2011-11-30 |
| JP2015007643A (en) | 2015-01-15 |
| EP1921991A4 (en) | 2009-06-17 |
| US7525647B2 (en) | 2009-04-28 |
| US20090234209A1 (en) | 2009-09-17 |
| JP5693548B2 (en) | 2015-04-01 |
| US20070055119A1 (en) | 2007-03-08 |
| CA2621171C (en) | 2016-01-26 |
| ES2875524T3 (en) | 2021-11-10 |
| CA2621171A1 (en) | 2007-03-15 |
| US7796247B2 (en) | 2010-09-14 |
| JP5919344B2 (en) | 2016-05-18 |
| EP3238623A1 (en) | 2017-11-01 |
| US20080108886A1 (en) | 2008-05-08 |
| EP2389862B1 (en) | 2017-04-19 |
| WO2007030331A1 (en) | 2007-03-15 |
| EP1921991B1 (en) | 2013-10-09 |
| EP1921991A1 (en) | 2008-05-21 |
| CN101272735B (en) | 2011-01-12 |
| US7538865B2 (en) | 2009-05-26 |
| US20080106792A1 (en) | 2008-05-08 |
| JP2013061345A (en) | 2013-04-04 |
| ES2441214T3 (en) | 2014-02-03 |
| EP3238623B1 (en) | 2021-03-17 |
| ES2633562T3 (en) | 2017-09-22 |
| JP2009508110A (en) | 2009-02-26 |
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